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Commit | Line | Data |
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26f54e9a MA |
1 | /* |
2 | * QEMU Block backends | |
3 | * | |
60cb2fa7 | 4 | * Copyright (C) 2014-2016 Red Hat, Inc. |
26f54e9a MA |
5 | * |
6 | * Authors: | |
7 | * Markus Armbruster <armbru@redhat.com>, | |
8 | * | |
9 | * This work is licensed under the terms of the GNU LGPL, version 2.1 | |
10 | * or later. See the COPYING.LIB file in the top-level directory. | |
11 | */ | |
12 | ||
80c71a24 | 13 | #include "qemu/osdep.h" |
26f54e9a MA |
14 | #include "sysemu/block-backend.h" |
15 | #include "block/block_int.h" | |
373340b2 | 16 | #include "block/blockjob.h" |
281d22d8 | 17 | #include "block/throttle-groups.h" |
18e46a03 | 18 | #include "sysemu/blockdev.h" |
373340b2 | 19 | #include "sysemu/sysemu.h" |
a7f53e26 | 20 | #include "qapi-event.h" |
f348b6d1 | 21 | #include "qemu/id.h" |
a7f53e26 MA |
22 | |
23 | /* Number of coroutines to reserve per attached device model */ | |
24 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 25 | |
1bf1cbc9 KW |
26 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
27 | ||
4981bdec HR |
28 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
29 | ||
26f54e9a MA |
30 | struct BlockBackend { |
31 | char *name; | |
32 | int refcnt; | |
f21d96d0 | 33 | BdrvChild *root; |
26f8b3a8 | 34 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 35 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 36 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 37 | BlockBackendPublic public; |
a7f53e26 MA |
38 | |
39 | void *dev; /* attached device model, if any */ | |
40 | /* TODO change to DeviceState when all users are qdevified */ | |
41 | const BlockDevOps *dev_ops; | |
42 | void *dev_opaque; | |
68e9ec01 HR |
43 | |
44 | /* the block size for which the guest device expects atomicity */ | |
45 | int guest_block_size; | |
7f0e9da6 | 46 | |
281d22d8 HR |
47 | /* If the BDS tree is removed, some of its options are stored here (which |
48 | * can be used to restore those options in the new BDS on insert) */ | |
49 | BlockBackendRootState root_state; | |
50 | ||
bfd18d1e KW |
51 | bool enable_write_cache; |
52 | ||
7f0e9da6 HR |
53 | /* I/O stats (display with "info blockstats"). */ |
54 | BlockAcctStats stats; | |
373340b2 HR |
55 | |
56 | BlockdevOnError on_read_error, on_write_error; | |
57 | bool iostatus_enabled; | |
58 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 59 | |
c10c9d96 KW |
60 | bool allow_write_beyond_eof; |
61 | ||
3301f6c6 | 62 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
26f54e9a MA |
63 | }; |
64 | ||
e7f7d676 HR |
65 | typedef struct BlockBackendAIOCB { |
66 | BlockAIOCB common; | |
67 | QEMUBH *bh; | |
4981bdec | 68 | BlockBackend *blk; |
e7f7d676 HR |
69 | int ret; |
70 | } BlockBackendAIOCB; | |
71 | ||
72 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 73 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
74 | .aiocb_size = sizeof(BlockBackendAIOCB), |
75 | }; | |
76 | ||
8fb3c76c MA |
77 | static void drive_info_del(DriveInfo *dinfo); |
78 | ||
2cf22d6a HR |
79 | /* All BlockBackends */ |
80 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
81 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
82 | ||
9492b0b9 HR |
83 | /* All BlockBackends referenced by the monitor and which are iterated through by |
84 | * blk_next() */ | |
85 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
86 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 87 | |
f21d96d0 KW |
88 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
89 | int parent_flags, QDict *parent_options) | |
90 | { | |
91 | /* We're not supposed to call this function for root nodes */ | |
92 | abort(); | |
93 | } | |
94 | ||
95 | static const BdrvChildRole child_root = { | |
96 | .inherit_options = blk_root_inherit_options, | |
97 | }; | |
98 | ||
26f54e9a | 99 | /* |
efaa7c4e | 100 | * Create a new BlockBackend with a reference count of one. |
26f54e9a MA |
101 | * Store an error through @errp on failure, unless it's null. |
102 | * Return the new BlockBackend on success, null on failure. | |
103 | */ | |
efaa7c4e | 104 | BlockBackend *blk_new(Error **errp) |
26f54e9a MA |
105 | { |
106 | BlockBackend *blk; | |
107 | ||
26f54e9a | 108 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 109 | blk->refcnt = 1; |
3301f6c6 HR |
110 | notifier_list_init(&blk->remove_bs_notifiers); |
111 | notifier_list_init(&blk->insert_bs_notifiers); | |
2cf22d6a | 112 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
113 | return blk; |
114 | } | |
115 | ||
7e7d56d9 MA |
116 | /* |
117 | * Create a new BlockBackend with a new BlockDriverState attached. | |
7e7d56d9 MA |
118 | * Otherwise just like blk_new(), which see. |
119 | */ | |
efaa7c4e | 120 | BlockBackend *blk_new_with_bs(Error **errp) |
7e7d56d9 MA |
121 | { |
122 | BlockBackend *blk; | |
123 | BlockDriverState *bs; | |
124 | ||
efaa7c4e | 125 | blk = blk_new(errp); |
7e7d56d9 MA |
126 | if (!blk) { |
127 | return NULL; | |
128 | } | |
129 | ||
7f06d47e | 130 | bs = bdrv_new_root(); |
f21d96d0 | 131 | blk->root = bdrv_root_attach_child(bs, "root", &child_root); |
7e7d56d9 MA |
132 | bs->blk = blk; |
133 | return blk; | |
134 | } | |
135 | ||
ca49a4fd HR |
136 | /* |
137 | * Calls blk_new_with_bs() and then calls bdrv_open() on the BlockDriverState. | |
138 | * | |
139 | * Just as with bdrv_open(), after having called this function the reference to | |
140 | * @options belongs to the block layer (even on failure). | |
141 | * | |
142 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
143 | * BDS tree just by specifying the @options QDict (or @reference, | |
144 | * alternatively). At the time of adding this function, this is not possible, | |
145 | * though, so callers of this function have to be able to specify @filename and | |
146 | * @flags. | |
147 | */ | |
efaa7c4e HR |
148 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
149 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
150 | { |
151 | BlockBackend *blk; | |
152 | int ret; | |
153 | ||
efaa7c4e | 154 | blk = blk_new_with_bs(errp); |
ca49a4fd HR |
155 | if (!blk) { |
156 | QDECREF(options); | |
157 | return NULL; | |
158 | } | |
159 | ||
f21d96d0 | 160 | ret = bdrv_open(&blk->root->bs, filename, reference, options, flags, errp); |
ca49a4fd HR |
161 | if (ret < 0) { |
162 | blk_unref(blk); | |
163 | return NULL; | |
164 | } | |
165 | ||
72e775c7 KW |
166 | blk_set_enable_write_cache(blk, true); |
167 | ||
ca49a4fd HR |
168 | return blk; |
169 | } | |
170 | ||
26f54e9a MA |
171 | static void blk_delete(BlockBackend *blk) |
172 | { | |
173 | assert(!blk->refcnt); | |
e5e78550 | 174 | assert(!blk->name); |
a7f53e26 | 175 | assert(!blk->dev); |
f21d96d0 | 176 | if (blk->root) { |
13855c6b | 177 | blk_remove_bs(blk); |
7e7d56d9 | 178 | } |
3301f6c6 HR |
179 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
180 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
281d22d8 HR |
181 | if (blk->root_state.throttle_state) { |
182 | g_free(blk->root_state.throttle_group); | |
183 | throttle_group_unref(blk->root_state.throttle_state); | |
184 | } | |
2cf22d6a | 185 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 186 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 187 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
188 | g_free(blk); |
189 | } | |
190 | ||
8fb3c76c MA |
191 | static void drive_info_del(DriveInfo *dinfo) |
192 | { | |
193 | if (!dinfo) { | |
194 | return; | |
195 | } | |
196 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
197 | g_free(dinfo->serial); |
198 | g_free(dinfo); | |
199 | } | |
200 | ||
f636ae85 AG |
201 | int blk_get_refcnt(BlockBackend *blk) |
202 | { | |
203 | return blk ? blk->refcnt : 0; | |
204 | } | |
205 | ||
26f54e9a MA |
206 | /* |
207 | * Increment @blk's reference count. | |
208 | * @blk must not be null. | |
209 | */ | |
210 | void blk_ref(BlockBackend *blk) | |
211 | { | |
212 | blk->refcnt++; | |
213 | } | |
214 | ||
215 | /* | |
216 | * Decrement @blk's reference count. | |
217 | * If this drops it to zero, destroy @blk. | |
218 | * For convenience, do nothing if @blk is null. | |
219 | */ | |
220 | void blk_unref(BlockBackend *blk) | |
221 | { | |
222 | if (blk) { | |
223 | assert(blk->refcnt > 0); | |
224 | if (!--blk->refcnt) { | |
225 | blk_delete(blk); | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
2cf22d6a HR |
230 | /* |
231 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
232 | * ones which are hidden (i.e. are not referenced by the monitor). | |
233 | */ | |
234 | static BlockBackend *blk_all_next(BlockBackend *blk) | |
235 | { | |
236 | return blk ? QTAILQ_NEXT(blk, link) | |
237 | : QTAILQ_FIRST(&block_backends); | |
238 | } | |
239 | ||
d8da3cef HR |
240 | void blk_remove_all_bs(void) |
241 | { | |
74d1b8fc | 242 | BlockBackend *blk = NULL; |
d8da3cef | 243 | |
2cf22d6a | 244 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
245 | AioContext *ctx = blk_get_aio_context(blk); |
246 | ||
247 | aio_context_acquire(ctx); | |
f21d96d0 | 248 | if (blk->root) { |
d8da3cef HR |
249 | blk_remove_bs(blk); |
250 | } | |
251 | aio_context_release(ctx); | |
252 | } | |
253 | } | |
254 | ||
26f54e9a | 255 | /* |
9492b0b9 | 256 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
257 | * If @blk is null, return the first one. |
258 | * Else, return @blk's next sibling, which may be null. | |
259 | * | |
260 | * To iterate over all BlockBackends, do | |
261 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
262 | * ... | |
263 | * } | |
264 | */ | |
265 | BlockBackend *blk_next(BlockBackend *blk) | |
266 | { | |
9492b0b9 HR |
267 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
268 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
269 | } |
270 | ||
981f4f57 HR |
271 | /* |
272 | * Iterates over all BlockDriverStates which are attached to a BlockBackend. | |
273 | * This function is for use by bdrv_next(). | |
274 | * | |
275 | * @bs must be NULL or a BDS that is attached to a BB. | |
276 | */ | |
277 | BlockDriverState *blk_next_root_bs(BlockDriverState *bs) | |
278 | { | |
279 | BlockBackend *blk; | |
280 | ||
281 | if (bs) { | |
282 | assert(bs->blk); | |
283 | blk = bs->blk; | |
284 | } else { | |
285 | blk = NULL; | |
286 | } | |
287 | ||
288 | do { | |
289 | blk = blk_all_next(blk); | |
f21d96d0 | 290 | } while (blk && !blk->root); |
981f4f57 | 291 | |
f21d96d0 | 292 | return blk ? blk->root->bs : NULL; |
981f4f57 HR |
293 | } |
294 | ||
e5e78550 HR |
295 | /* |
296 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
297 | * the given @name acting as the handle for the monitor. | |
298 | * Strictly for use by blockdev.c. | |
299 | * | |
300 | * @name must not be null or empty. | |
301 | * | |
302 | * Returns true on success and false on failure. In the latter case, an Error | |
303 | * object is returned through @errp. | |
304 | */ | |
305 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
306 | { | |
307 | assert(!blk->name); | |
308 | assert(name && name[0]); | |
309 | ||
310 | if (!id_wellformed(name)) { | |
311 | error_setg(errp, "Invalid device name"); | |
312 | return false; | |
313 | } | |
314 | if (blk_by_name(name)) { | |
315 | error_setg(errp, "Device with id '%s' already exists", name); | |
316 | return false; | |
317 | } | |
318 | if (bdrv_find_node(name)) { | |
319 | error_setg(errp, | |
320 | "Device name '%s' conflicts with an existing node name", | |
321 | name); | |
322 | return false; | |
323 | } | |
324 | ||
325 | blk->name = g_strdup(name); | |
326 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
327 | return true; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
332 | * Strictly for use by blockdev.c. | |
333 | */ | |
334 | void monitor_remove_blk(BlockBackend *blk) | |
335 | { | |
336 | if (!blk->name) { | |
337 | return; | |
338 | } | |
339 | ||
340 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
341 | g_free(blk->name); | |
342 | blk->name = NULL; | |
343 | } | |
344 | ||
26f54e9a | 345 | /* |
7e7d56d9 | 346 | * Return @blk's name, a non-null string. |
e5e78550 | 347 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a MA |
348 | */ |
349 | const char *blk_name(BlockBackend *blk) | |
350 | { | |
e5e78550 | 351 | return blk->name ?: ""; |
26f54e9a MA |
352 | } |
353 | ||
354 | /* | |
355 | * Return the BlockBackend with name @name if it exists, else null. | |
356 | * @name must not be null. | |
357 | */ | |
358 | BlockBackend *blk_by_name(const char *name) | |
359 | { | |
74d1b8fc | 360 | BlockBackend *blk = NULL; |
26f54e9a MA |
361 | |
362 | assert(name); | |
74d1b8fc | 363 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
364 | if (!strcmp(name, blk->name)) { |
365 | return blk; | |
366 | } | |
367 | } | |
368 | return NULL; | |
369 | } | |
7e7d56d9 MA |
370 | |
371 | /* | |
372 | * Return the BlockDriverState attached to @blk if any, else null. | |
373 | */ | |
374 | BlockDriverState *blk_bs(BlockBackend *blk) | |
375 | { | |
f21d96d0 | 376 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
377 | } |
378 | ||
18e46a03 MA |
379 | /* |
380 | * Return @blk's DriveInfo if any, else null. | |
381 | */ | |
382 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
383 | { | |
384 | return blk->legacy_dinfo; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Set @blk's DriveInfo to @dinfo, and return it. | |
389 | * @blk must not have a DriveInfo set already. | |
390 | * No other BlockBackend may have the same DriveInfo set. | |
391 | */ | |
392 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
393 | { | |
394 | assert(!blk->legacy_dinfo); | |
395 | return blk->legacy_dinfo = dinfo; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Return the BlockBackend with DriveInfo @dinfo. | |
400 | * It must exist. | |
401 | */ | |
402 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
403 | { | |
74d1b8fc | 404 | BlockBackend *blk = NULL; |
18e46a03 | 405 | |
74d1b8fc | 406 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
407 | if (blk->legacy_dinfo == dinfo) { |
408 | return blk; | |
409 | } | |
410 | } | |
411 | abort(); | |
412 | } | |
413 | ||
f2cd875d KW |
414 | /* |
415 | * Returns a pointer to the publicly accessible fields of @blk. | |
416 | */ | |
417 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
418 | { | |
419 | return &blk->public; | |
420 | } | |
421 | ||
422 | /* | |
423 | * Returns a BlockBackend given the associated @public fields. | |
424 | */ | |
425 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
426 | { | |
427 | return container_of(public, BlockBackend, public); | |
428 | } | |
429 | ||
1c95f7e1 HR |
430 | /* |
431 | * Disassociates the currently associated BlockDriverState from @blk. | |
432 | */ | |
433 | void blk_remove_bs(BlockBackend *blk) | |
434 | { | |
f21d96d0 | 435 | assert(blk->root->bs->blk == blk); |
13855c6b | 436 | |
3301f6c6 HR |
437 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
438 | ||
1c95f7e1 | 439 | blk_update_root_state(blk); |
a5614993 KW |
440 | if (blk->root->bs->throttle_state) { |
441 | bdrv_io_limits_disable(blk->root->bs); | |
442 | } | |
1c95f7e1 | 443 | |
f21d96d0 KW |
444 | blk->root->bs->blk = NULL; |
445 | bdrv_root_unref_child(blk->root); | |
446 | blk->root = NULL; | |
1c95f7e1 HR |
447 | } |
448 | ||
0c3c36d6 HR |
449 | /* |
450 | * Associates a new BlockDriverState with @blk. | |
451 | */ | |
452 | void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) | |
453 | { | |
f21d96d0 | 454 | assert(!blk->root && !bs->blk); |
0c3c36d6 | 455 | bdrv_ref(bs); |
f21d96d0 | 456 | blk->root = bdrv_root_attach_child(bs, "root", &child_root); |
0c3c36d6 | 457 | bs->blk = blk; |
3301f6c6 HR |
458 | |
459 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
0c3c36d6 HR |
460 | } |
461 | ||
a7f53e26 MA |
462 | /* |
463 | * Attach device model @dev to @blk. | |
464 | * Return 0 on success, -EBUSY when a device model is attached already. | |
465 | */ | |
4be74634 | 466 | int blk_attach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 467 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 468 | { |
a7f53e26 MA |
469 | if (blk->dev) { |
470 | return -EBUSY; | |
471 | } | |
84ebe375 | 472 | blk_ref(blk); |
a7f53e26 | 473 | blk->dev = dev; |
373340b2 | 474 | blk_iostatus_reset(blk); |
a7f53e26 | 475 | return 0; |
4be74634 MA |
476 | } |
477 | ||
a7f53e26 MA |
478 | /* |
479 | * Attach device model @dev to @blk. | |
480 | * @blk must not have a device model attached already. | |
481 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
482 | */ | |
4be74634 MA |
483 | void blk_attach_dev_nofail(BlockBackend *blk, void *dev) |
484 | { | |
a7f53e26 MA |
485 | if (blk_attach_dev(blk, dev) < 0) { |
486 | abort(); | |
487 | } | |
4be74634 MA |
488 | } |
489 | ||
a7f53e26 MA |
490 | /* |
491 | * Detach device model @dev from @blk. | |
492 | * @dev must be currently attached to @blk. | |
493 | */ | |
4be74634 | 494 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 495 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 496 | { |
a7f53e26 MA |
497 | assert(blk->dev == dev); |
498 | blk->dev = NULL; | |
499 | blk->dev_ops = NULL; | |
500 | blk->dev_opaque = NULL; | |
68e9ec01 | 501 | blk->guest_block_size = 512; |
84ebe375 | 502 | blk_unref(blk); |
4be74634 MA |
503 | } |
504 | ||
a7f53e26 MA |
505 | /* |
506 | * Return the device model attached to @blk if any, else null. | |
507 | */ | |
4be74634 | 508 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
509 | /* TODO change to return DeviceState * when all users are qdevified */ |
510 | { | |
511 | return blk->dev; | |
512 | } | |
513 | ||
514 | /* | |
515 | * Set @blk's device model callbacks to @ops. | |
516 | * @opaque is the opaque argument to pass to the callbacks. | |
517 | * This is for use by device models. | |
518 | */ | |
519 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
520 | void *opaque) | |
521 | { | |
522 | blk->dev_ops = ops; | |
523 | blk->dev_opaque = opaque; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Notify @blk's attached device model of media change. | |
528 | * If @load is true, notify of media load. | |
529 | * Else, notify of media eject. | |
530 | * Also send DEVICE_TRAY_MOVED events as appropriate. | |
531 | */ | |
532 | void blk_dev_change_media_cb(BlockBackend *blk, bool load) | |
533 | { | |
534 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 535 | bool tray_was_open, tray_is_open; |
a7f53e26 | 536 | |
f1f57066 | 537 | tray_was_open = blk_dev_is_tray_open(blk); |
a7f53e26 | 538 | blk->dev_ops->change_media_cb(blk->dev_opaque, load); |
f1f57066 HR |
539 | tray_is_open = blk_dev_is_tray_open(blk); |
540 | ||
541 | if (tray_was_open != tray_is_open) { | |
542 | qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open, | |
543 | &error_abort); | |
a7f53e26 MA |
544 | } |
545 | } | |
546 | } | |
547 | ||
548 | /* | |
549 | * Does @blk's attached device model have removable media? | |
550 | * %true if no device model is attached. | |
551 | */ | |
552 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
553 | { | |
554 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
555 | } | |
556 | ||
8f3a73bc HR |
557 | /* |
558 | * Does @blk's attached device model have a tray? | |
559 | */ | |
560 | bool blk_dev_has_tray(BlockBackend *blk) | |
561 | { | |
562 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
563 | } | |
564 | ||
a7f53e26 MA |
565 | /* |
566 | * Notify @blk's attached device model of a media eject request. | |
567 | * If @force is true, the medium is about to be yanked out forcefully. | |
568 | */ | |
569 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 570 | { |
a7f53e26 MA |
571 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
572 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
573 | } | |
4be74634 MA |
574 | } |
575 | ||
a7f53e26 MA |
576 | /* |
577 | * Does @blk's attached device model have a tray, and is it open? | |
578 | */ | |
579 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 580 | { |
8f3a73bc | 581 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
582 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
583 | } | |
584 | return false; | |
585 | } | |
586 | ||
587 | /* | |
588 | * Does @blk's attached device model have the medium locked? | |
589 | * %false if the device model has no such lock. | |
590 | */ | |
591 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
592 | { | |
593 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
594 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
595 | } | |
596 | return false; | |
597 | } | |
598 | ||
599 | /* | |
600 | * Notify @blk's attached device model of a backend size change. | |
601 | */ | |
602 | void blk_dev_resize_cb(BlockBackend *blk) | |
603 | { | |
604 | if (blk->dev_ops && blk->dev_ops->resize_cb) { | |
605 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
606 | } | |
607 | } | |
608 | ||
609 | void blk_iostatus_enable(BlockBackend *blk) | |
610 | { | |
373340b2 HR |
611 | blk->iostatus_enabled = true; |
612 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
613 | } | |
614 | ||
615 | /* The I/O status is only enabled if the drive explicitly | |
616 | * enables it _and_ the VM is configured to stop on errors */ | |
617 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
618 | { | |
619 | return (blk->iostatus_enabled && | |
620 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
621 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
622 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
623 | } | |
624 | ||
625 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
626 | { | |
627 | return blk->iostatus; | |
628 | } | |
629 | ||
630 | void blk_iostatus_disable(BlockBackend *blk) | |
631 | { | |
632 | blk->iostatus_enabled = false; | |
633 | } | |
634 | ||
635 | void blk_iostatus_reset(BlockBackend *blk) | |
636 | { | |
637 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 638 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 639 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
640 | if (bs && bs->job) { |
641 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
642 | } |
643 | } | |
644 | } | |
645 | ||
646 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
647 | { | |
648 | assert(blk_iostatus_is_enabled(blk)); | |
649 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
650 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
651 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
652 | } | |
4be74634 MA |
653 | } |
654 | ||
c10c9d96 KW |
655 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
656 | { | |
657 | blk->allow_write_beyond_eof = allow; | |
658 | } | |
659 | ||
e7f7d676 HR |
660 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
661 | size_t size) | |
662 | { | |
663 | int64_t len; | |
664 | ||
665 | if (size > INT_MAX) { | |
666 | return -EIO; | |
667 | } | |
668 | ||
c09ba36c | 669 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
670 | return -ENOMEDIUM; |
671 | } | |
672 | ||
e7f7d676 HR |
673 | if (offset < 0) { |
674 | return -EIO; | |
675 | } | |
676 | ||
c10c9d96 KW |
677 | if (!blk->allow_write_beyond_eof) { |
678 | len = blk_getlength(blk); | |
679 | if (len < 0) { | |
680 | return len; | |
681 | } | |
682 | ||
683 | if (offset > len || len - offset < size) { | |
684 | return -EIO; | |
685 | } | |
e7f7d676 HR |
686 | } |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | static int blk_check_request(BlockBackend *blk, int64_t sector_num, | |
692 | int nb_sectors) | |
693 | { | |
694 | if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) { | |
695 | return -EIO; | |
696 | } | |
697 | ||
698 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { | |
699 | return -EIO; | |
700 | } | |
701 | ||
702 | return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE, | |
703 | nb_sectors * BDRV_SECTOR_SIZE); | |
704 | } | |
705 | ||
1bf1cbc9 KW |
706 | static int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
707 | unsigned int bytes, QEMUIOVector *qiov, | |
708 | BdrvRequestFlags flags) | |
4be74634 | 709 | { |
1bf1cbc9 | 710 | int ret = blk_check_byte_request(blk, offset, bytes); |
e7f7d676 HR |
711 | if (ret < 0) { |
712 | return ret; | |
713 | } | |
714 | ||
cab3a356 | 715 | return bdrv_co_preadv(blk_bs(blk), offset, bytes, qiov, flags); |
1bf1cbc9 KW |
716 | } |
717 | ||
a8823a3b KW |
718 | static int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
719 | unsigned int bytes, QEMUIOVector *qiov, | |
720 | BdrvRequestFlags flags) | |
721 | { | |
bfd18d1e KW |
722 | int ret; |
723 | ||
724 | ret = blk_check_byte_request(blk, offset, bytes); | |
a8823a3b KW |
725 | if (ret < 0) { |
726 | return ret; | |
727 | } | |
728 | ||
bfd18d1e KW |
729 | if (!blk->enable_write_cache) { |
730 | flags |= BDRV_REQ_FUA; | |
731 | } | |
732 | ||
cab3a356 | 733 | return bdrv_co_pwritev(blk_bs(blk), offset, bytes, qiov, flags); |
a8823a3b KW |
734 | } |
735 | ||
1bf1cbc9 KW |
736 | typedef struct BlkRwCo { |
737 | BlockBackend *blk; | |
738 | int64_t offset; | |
739 | QEMUIOVector *qiov; | |
740 | int ret; | |
741 | BdrvRequestFlags flags; | |
742 | } BlkRwCo; | |
743 | ||
744 | static void blk_read_entry(void *opaque) | |
745 | { | |
746 | BlkRwCo *rwco = opaque; | |
747 | ||
748 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
749 | rwco->qiov, rwco->flags); | |
750 | } | |
751 | ||
a8823a3b KW |
752 | static void blk_write_entry(void *opaque) |
753 | { | |
754 | BlkRwCo *rwco = opaque; | |
755 | ||
756 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
757 | rwco->qiov, rwco->flags); | |
758 | } | |
759 | ||
a55d3fba KW |
760 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
761 | int64_t bytes, CoroutineEntry co_entry, | |
762 | BdrvRequestFlags flags) | |
1bf1cbc9 KW |
763 | { |
764 | AioContext *aio_context; | |
765 | QEMUIOVector qiov; | |
766 | struct iovec iov; | |
767 | Coroutine *co; | |
768 | BlkRwCo rwco; | |
769 | ||
1bf1cbc9 KW |
770 | iov = (struct iovec) { |
771 | .iov_base = buf, | |
a55d3fba | 772 | .iov_len = bytes, |
1bf1cbc9 KW |
773 | }; |
774 | qemu_iovec_init_external(&qiov, &iov, 1); | |
775 | ||
776 | rwco = (BlkRwCo) { | |
777 | .blk = blk, | |
a55d3fba | 778 | .offset = offset, |
1bf1cbc9 | 779 | .qiov = &qiov, |
fc1453cd | 780 | .flags = flags, |
1bf1cbc9 KW |
781 | .ret = NOT_DONE, |
782 | }; | |
783 | ||
a8823a3b | 784 | co = qemu_coroutine_create(co_entry); |
1bf1cbc9 KW |
785 | qemu_coroutine_enter(co, &rwco); |
786 | ||
787 | aio_context = blk_get_aio_context(blk); | |
788 | while (rwco.ret == NOT_DONE) { | |
789 | aio_poll(aio_context, true); | |
790 | } | |
791 | ||
792 | return rwco.ret; | |
4be74634 MA |
793 | } |
794 | ||
b7d17f9f EB |
795 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
796 | int count) | |
4be74634 | 797 | { |
5bd51196 | 798 | BlockDriverState *bs = blk_bs(blk); |
5bd51196 KW |
799 | int ret; |
800 | ||
b7d17f9f | 801 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
802 | if (ret < 0) { |
803 | return ret; | |
804 | } | |
805 | ||
ce0f1412 | 806 | bdrv_no_throttling_begin(bs); |
b7d17f9f | 807 | ret = blk_pread(blk, offset, buf, count); |
ce0f1412 | 808 | bdrv_no_throttling_end(bs); |
5bd51196 | 809 | return ret; |
4be74634 MA |
810 | } |
811 | ||
983a1600 EB |
812 | int blk_write_zeroes(BlockBackend *blk, int64_t offset, |
813 | int count, BdrvRequestFlags flags) | |
0df89e8e | 814 | { |
983a1600 EB |
815 | return blk_prw(blk, offset, NULL, count, blk_write_entry, |
816 | flags | BDRV_REQ_ZERO_WRITE); | |
0df89e8e KW |
817 | } |
818 | ||
e7f7d676 HR |
819 | static void error_callback_bh(void *opaque) |
820 | { | |
821 | struct BlockBackendAIOCB *acb = opaque; | |
822 | qemu_bh_delete(acb->bh); | |
823 | acb->common.cb(acb->common.opaque, acb->ret); | |
824 | qemu_aio_unref(acb); | |
825 | } | |
826 | ||
ca78ecfa PL |
827 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
828 | BlockCompletionFunc *cb, | |
829 | void *opaque, int ret) | |
e7f7d676 HR |
830 | { |
831 | struct BlockBackendAIOCB *acb; | |
832 | QEMUBH *bh; | |
833 | ||
834 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); | |
4981bdec | 835 | acb->blk = blk; |
e7f7d676 HR |
836 | acb->ret = ret; |
837 | ||
838 | bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb); | |
839 | acb->bh = bh; | |
840 | qemu_bh_schedule(bh); | |
841 | ||
842 | return &acb->common; | |
843 | } | |
844 | ||
57d6a428 KW |
845 | typedef struct BlkAioEmAIOCB { |
846 | BlockAIOCB common; | |
847 | BlkRwCo rwco; | |
7fa84cd8 | 848 | int bytes; |
57d6a428 KW |
849 | bool has_returned; |
850 | QEMUBH* bh; | |
851 | } BlkAioEmAIOCB; | |
852 | ||
853 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
854 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
855 | }; | |
856 | ||
857 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
858 | { | |
859 | if (acb->bh) { | |
860 | assert(acb->has_returned); | |
861 | qemu_bh_delete(acb->bh); | |
862 | } | |
863 | if (acb->has_returned) { | |
864 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
865 | qemu_aio_unref(acb); | |
866 | } | |
867 | } | |
868 | ||
869 | static void blk_aio_complete_bh(void *opaque) | |
870 | { | |
871 | blk_aio_complete(opaque); | |
872 | } | |
873 | ||
7fa84cd8 | 874 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
875 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
876 | BdrvRequestFlags flags, | |
877 | BlockCompletionFunc *cb, void *opaque) | |
878 | { | |
879 | BlkAioEmAIOCB *acb; | |
880 | Coroutine *co; | |
881 | ||
882 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
883 | acb->rwco = (BlkRwCo) { | |
884 | .blk = blk, | |
885 | .offset = offset, | |
886 | .qiov = qiov, | |
887 | .flags = flags, | |
888 | .ret = NOT_DONE, | |
889 | }; | |
7fa84cd8 | 890 | acb->bytes = bytes; |
57d6a428 KW |
891 | acb->bh = NULL; |
892 | acb->has_returned = false; | |
893 | ||
894 | co = qemu_coroutine_create(co_entry); | |
895 | qemu_coroutine_enter(co, acb); | |
896 | ||
897 | acb->has_returned = true; | |
898 | if (acb->rwco.ret != NOT_DONE) { | |
899 | acb->bh = aio_bh_new(blk_get_aio_context(blk), blk_aio_complete_bh, acb); | |
900 | qemu_bh_schedule(acb->bh); | |
901 | } | |
902 | ||
903 | return &acb->common; | |
904 | } | |
905 | ||
906 | static void blk_aio_read_entry(void *opaque) | |
907 | { | |
908 | BlkAioEmAIOCB *acb = opaque; | |
909 | BlkRwCo *rwco = &acb->rwco; | |
910 | ||
7fa84cd8 KW |
911 | assert(rwco->qiov->size == acb->bytes); |
912 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
913 | rwco->qiov, rwco->flags); |
914 | blk_aio_complete(acb); | |
915 | } | |
916 | ||
917 | static void blk_aio_write_entry(void *opaque) | |
918 | { | |
919 | BlkAioEmAIOCB *acb = opaque; | |
920 | BlkRwCo *rwco = &acb->rwco; | |
921 | ||
7fa84cd8 KW |
922 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
923 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
924 | rwco->qiov, rwco->flags); |
925 | blk_aio_complete(acb); | |
926 | } | |
927 | ||
983a1600 EB |
928 | BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t offset, |
929 | int count, BdrvRequestFlags flags, | |
4be74634 MA |
930 | BlockCompletionFunc *cb, void *opaque) |
931 | { | |
983a1600 EB |
932 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
933 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
934 | } |
935 | ||
936 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
937 | { | |
a55d3fba | 938 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
939 | if (ret < 0) { |
940 | return ret; | |
941 | } | |
a55d3fba | 942 | return count; |
4be74634 MA |
943 | } |
944 | ||
8341f00d EB |
945 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
946 | BdrvRequestFlags flags) | |
4be74634 | 947 | { |
8341f00d EB |
948 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
949 | flags); | |
e7f7d676 HR |
950 | if (ret < 0) { |
951 | return ret; | |
952 | } | |
a55d3fba | 953 | return count; |
4be74634 MA |
954 | } |
955 | ||
956 | int64_t blk_getlength(BlockBackend *blk) | |
957 | { | |
c09ba36c HR |
958 | if (!blk_is_available(blk)) { |
959 | return -ENOMEDIUM; | |
960 | } | |
961 | ||
f21d96d0 | 962 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
963 | } |
964 | ||
965 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
966 | { | |
f21d96d0 | 967 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
968 | *nb_sectors_ptr = 0; |
969 | } else { | |
f21d96d0 | 970 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 971 | } |
4be74634 MA |
972 | } |
973 | ||
1ef01253 HR |
974 | int64_t blk_nb_sectors(BlockBackend *blk) |
975 | { | |
c09ba36c HR |
976 | if (!blk_is_available(blk)) { |
977 | return -ENOMEDIUM; | |
978 | } | |
979 | ||
f21d96d0 | 980 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
981 | } |
982 | ||
60cb2fa7 EB |
983 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
984 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
985 | BlockCompletionFunc *cb, void *opaque) | |
986 | { | |
987 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
988 | blk_aio_read_entry, flags, cb, opaque); | |
989 | } | |
990 | ||
60cb2fa7 EB |
991 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
992 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
993 | BlockCompletionFunc *cb, void *opaque) | |
994 | { | |
995 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
996 | blk_aio_write_entry, flags, cb, opaque); | |
997 | } | |
998 | ||
4be74634 MA |
999 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1000 | BlockCompletionFunc *cb, void *opaque) | |
1001 | { | |
c09ba36c | 1002 | if (!blk_is_available(blk)) { |
ca78ecfa | 1003 | return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM); |
c09ba36c HR |
1004 | } |
1005 | ||
f21d96d0 | 1006 | return bdrv_aio_flush(blk_bs(blk), cb, opaque); |
4be74634 MA |
1007 | } |
1008 | ||
1009 | BlockAIOCB *blk_aio_discard(BlockBackend *blk, | |
1010 | int64_t sector_num, int nb_sectors, | |
1011 | BlockCompletionFunc *cb, void *opaque) | |
1012 | { | |
e7f7d676 HR |
1013 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1014 | if (ret < 0) { | |
ca78ecfa | 1015 | return blk_abort_aio_request(blk, cb, opaque, ret); |
e7f7d676 HR |
1016 | } |
1017 | ||
f21d96d0 | 1018 | return bdrv_aio_discard(blk_bs(blk), sector_num, nb_sectors, cb, opaque); |
4be74634 MA |
1019 | } |
1020 | ||
1021 | void blk_aio_cancel(BlockAIOCB *acb) | |
1022 | { | |
1023 | bdrv_aio_cancel(acb); | |
1024 | } | |
1025 | ||
1026 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1027 | { | |
1028 | bdrv_aio_cancel_async(acb); | |
1029 | } | |
1030 | ||
1031 | int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs) | |
1032 | { | |
e7f7d676 HR |
1033 | int i, ret; |
1034 | ||
1035 | for (i = 0; i < num_reqs; i++) { | |
1036 | ret = blk_check_request(blk, reqs[i].sector, reqs[i].nb_sectors); | |
1037 | if (ret < 0) { | |
1038 | return ret; | |
1039 | } | |
1040 | } | |
1041 | ||
f21d96d0 | 1042 | return bdrv_aio_multiwrite(blk_bs(blk), reqs, num_reqs); |
4be74634 MA |
1043 | } |
1044 | ||
1045 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1046 | { | |
c09ba36c HR |
1047 | if (!blk_is_available(blk)) { |
1048 | return -ENOMEDIUM; | |
1049 | } | |
1050 | ||
f21d96d0 | 1051 | return bdrv_ioctl(blk_bs(blk), req, buf); |
4be74634 MA |
1052 | } |
1053 | ||
1054 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1055 | BlockCompletionFunc *cb, void *opaque) | |
1056 | { | |
c09ba36c | 1057 | if (!blk_is_available(blk)) { |
ca78ecfa | 1058 | return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM); |
c09ba36c HR |
1059 | } |
1060 | ||
f21d96d0 | 1061 | return bdrv_aio_ioctl(blk_bs(blk), req, buf, cb, opaque); |
4be74634 MA |
1062 | } |
1063 | ||
2bb0dce7 HR |
1064 | int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) |
1065 | { | |
e7f7d676 HR |
1066 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1067 | if (ret < 0) { | |
1068 | return ret; | |
1069 | } | |
1070 | ||
f21d96d0 | 1071 | return bdrv_co_discard(blk_bs(blk), sector_num, nb_sectors); |
2bb0dce7 HR |
1072 | } |
1073 | ||
1074 | int blk_co_flush(BlockBackend *blk) | |
1075 | { | |
c09ba36c HR |
1076 | if (!blk_is_available(blk)) { |
1077 | return -ENOMEDIUM; | |
1078 | } | |
1079 | ||
f21d96d0 | 1080 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1081 | } |
1082 | ||
4be74634 MA |
1083 | int blk_flush(BlockBackend *blk) |
1084 | { | |
c09ba36c HR |
1085 | if (!blk_is_available(blk)) { |
1086 | return -ENOMEDIUM; | |
1087 | } | |
1088 | ||
f21d96d0 | 1089 | return bdrv_flush(blk_bs(blk)); |
4be74634 MA |
1090 | } |
1091 | ||
97b0385a AY |
1092 | void blk_drain(BlockBackend *blk) |
1093 | { | |
f21d96d0 KW |
1094 | if (blk_bs(blk)) { |
1095 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1096 | } |
97b0385a AY |
1097 | } |
1098 | ||
4be74634 MA |
1099 | void blk_drain_all(void) |
1100 | { | |
1101 | bdrv_drain_all(); | |
1102 | } | |
1103 | ||
373340b2 HR |
1104 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1105 | BlockdevOnError on_write_error) | |
1106 | { | |
1107 | blk->on_read_error = on_read_error; | |
1108 | blk->on_write_error = on_write_error; | |
1109 | } | |
1110 | ||
4be74634 MA |
1111 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1112 | { | |
373340b2 | 1113 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1114 | } |
1115 | ||
1116 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1117 | int error) | |
1118 | { | |
373340b2 HR |
1119 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1120 | ||
1121 | switch (on_err) { | |
1122 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1123 | return (error == ENOSPC) ? | |
1124 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1125 | case BLOCKDEV_ON_ERROR_STOP: | |
1126 | return BLOCK_ERROR_ACTION_STOP; | |
1127 | case BLOCKDEV_ON_ERROR_REPORT: | |
1128 | return BLOCK_ERROR_ACTION_REPORT; | |
1129 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1130 | return BLOCK_ERROR_ACTION_IGNORE; | |
1131 | default: | |
1132 | abort(); | |
1133 | } | |
4be74634 MA |
1134 | } |
1135 | ||
373340b2 HR |
1136 | static void send_qmp_error_event(BlockBackend *blk, |
1137 | BlockErrorAction action, | |
1138 | bool is_read, int error) | |
1139 | { | |
1140 | IoOperationType optype; | |
1141 | ||
1142 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
1143 | qapi_event_send_block_io_error(blk_name(blk), optype, action, | |
1144 | blk_iostatus_is_enabled(blk), | |
1145 | error == ENOSPC, strerror(error), | |
1146 | &error_abort); | |
1147 | } | |
1148 | ||
1149 | /* This is done by device models because, while the block layer knows | |
1150 | * about the error, it does not know whether an operation comes from | |
1151 | * the device or the block layer (from a job, for example). | |
1152 | */ | |
4be74634 MA |
1153 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1154 | bool is_read, int error) | |
1155 | { | |
373340b2 HR |
1156 | assert(error >= 0); |
1157 | ||
1158 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1159 | /* First set the iostatus, so that "info block" returns an iostatus | |
1160 | * that matches the events raised so far (an additional error iostatus | |
1161 | * is fine, but not a lost one). | |
1162 | */ | |
1163 | blk_iostatus_set_err(blk, error); | |
1164 | ||
1165 | /* Then raise the request to stop the VM and the event. | |
1166 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1167 | * it ensures that the STOP event always comes after the | |
1168 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1169 | * can observe the STOP event and do a "cont" before the STOP | |
1170 | * event is issued, the VM will not stop. In this case, vm_start() | |
1171 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1172 | */ | |
1173 | qemu_system_vmstop_request_prepare(); | |
1174 | send_qmp_error_event(blk, action, is_read, error); | |
1175 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1176 | } else { | |
1177 | send_qmp_error_event(blk, action, is_read, error); | |
1178 | } | |
4be74634 MA |
1179 | } |
1180 | ||
1181 | int blk_is_read_only(BlockBackend *blk) | |
1182 | { | |
f21d96d0 KW |
1183 | BlockDriverState *bs = blk_bs(blk); |
1184 | ||
1185 | if (bs) { | |
1186 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1187 | } else { |
1188 | return blk->root_state.read_only; | |
1189 | } | |
4be74634 MA |
1190 | } |
1191 | ||
1192 | int blk_is_sg(BlockBackend *blk) | |
1193 | { | |
f21d96d0 KW |
1194 | BlockDriverState *bs = blk_bs(blk); |
1195 | ||
1196 | if (!bs) { | |
a46fc9c9 HR |
1197 | return 0; |
1198 | } | |
1199 | ||
f21d96d0 | 1200 | return bdrv_is_sg(bs); |
4be74634 MA |
1201 | } |
1202 | ||
1203 | int blk_enable_write_cache(BlockBackend *blk) | |
1204 | { | |
bfd18d1e | 1205 | return blk->enable_write_cache; |
4be74634 MA |
1206 | } |
1207 | ||
1208 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1209 | { | |
bfd18d1e | 1210 | blk->enable_write_cache = wce; |
4be74634 MA |
1211 | } |
1212 | ||
2bb0dce7 HR |
1213 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1214 | { | |
f21d96d0 KW |
1215 | BlockDriverState *bs = blk_bs(blk); |
1216 | ||
1217 | if (!bs) { | |
c09ba36c HR |
1218 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1219 | return; | |
1220 | } | |
1221 | ||
f21d96d0 | 1222 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1223 | } |
1224 | ||
e031f750 | 1225 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1226 | { |
f21d96d0 KW |
1227 | BlockDriverState *bs = blk_bs(blk); |
1228 | ||
1229 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1230 | } |
1231 | ||
1232 | bool blk_is_available(BlockBackend *blk) | |
1233 | { | |
1234 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1235 | } |
1236 | ||
1237 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1238 | { | |
f21d96d0 KW |
1239 | BlockDriverState *bs = blk_bs(blk); |
1240 | ||
1241 | if (bs) { | |
1242 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1243 | } |
4be74634 MA |
1244 | } |
1245 | ||
1246 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1247 | { | |
f21d96d0 KW |
1248 | BlockDriverState *bs = blk_bs(blk); |
1249 | ||
1250 | if (bs) { | |
1251 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1252 | } |
4be74634 MA |
1253 | } |
1254 | ||
1255 | int blk_get_flags(BlockBackend *blk) | |
1256 | { | |
f21d96d0 KW |
1257 | BlockDriverState *bs = blk_bs(blk); |
1258 | ||
1259 | if (bs) { | |
1260 | return bdrv_get_flags(bs); | |
061959e8 HR |
1261 | } else { |
1262 | return blk->root_state.open_flags; | |
1263 | } | |
4be74634 MA |
1264 | } |
1265 | ||
454057b7 PL |
1266 | int blk_get_max_transfer_length(BlockBackend *blk) |
1267 | { | |
f21d96d0 KW |
1268 | BlockDriverState *bs = blk_bs(blk); |
1269 | ||
1270 | if (bs) { | |
1271 | return bs->bl.max_transfer_length; | |
a46fc9c9 HR |
1272 | } else { |
1273 | return 0; | |
1274 | } | |
454057b7 PL |
1275 | } |
1276 | ||
648296e0 SH |
1277 | int blk_get_max_iov(BlockBackend *blk) |
1278 | { | |
f21d96d0 | 1279 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1280 | } |
1281 | ||
4be74634 MA |
1282 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1283 | { | |
68e9ec01 | 1284 | blk->guest_block_size = align; |
4be74634 MA |
1285 | } |
1286 | ||
f1c17521 PB |
1287 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1288 | { | |
f21d96d0 | 1289 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1290 | } |
1291 | ||
4be74634 MA |
1292 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1293 | { | |
f21d96d0 | 1294 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1295 | } |
1296 | ||
1297 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1298 | { | |
f21d96d0 KW |
1299 | BlockDriverState *bs = blk_bs(blk); |
1300 | ||
1301 | if (!bs) { | |
a46fc9c9 HR |
1302 | return false; |
1303 | } | |
1304 | ||
f21d96d0 | 1305 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1306 | } |
1307 | ||
1308 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1309 | { | |
f21d96d0 KW |
1310 | BlockDriverState *bs = blk_bs(blk); |
1311 | ||
1312 | if (bs) { | |
1313 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1314 | } |
4be74634 MA |
1315 | } |
1316 | ||
1317 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1318 | { | |
f21d96d0 KW |
1319 | BlockDriverState *bs = blk_bs(blk); |
1320 | ||
1321 | if (bs) { | |
1322 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1323 | } |
4be74634 MA |
1324 | } |
1325 | ||
1326 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1327 | { | |
f21d96d0 KW |
1328 | BlockDriverState *bs = blk_bs(blk); |
1329 | ||
1330 | if (bs) { | |
1331 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1332 | } |
4be74634 MA |
1333 | } |
1334 | ||
1335 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1336 | { | |
f21d96d0 KW |
1337 | BlockDriverState *bs = blk_bs(blk); |
1338 | ||
1339 | if (bs) { | |
1340 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1341 | } else { |
1342 | return qemu_get_aio_context(); | |
1343 | } | |
1344 | } | |
1345 | ||
1346 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1347 | { | |
1348 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1349 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1350 | } |
1351 | ||
1352 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1353 | { | |
f21d96d0 KW |
1354 | BlockDriverState *bs = blk_bs(blk); |
1355 | ||
1356 | if (bs) { | |
1357 | bdrv_set_aio_context(bs, new_context); | |
a46fc9c9 | 1358 | } |
4be74634 MA |
1359 | } |
1360 | ||
2019ba0a HR |
1361 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1362 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1363 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1364 | { | |
f21d96d0 KW |
1365 | BlockDriverState *bs = blk_bs(blk); |
1366 | ||
1367 | if (bs) { | |
1368 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1369 | detach_aio_context, opaque); |
1370 | } | |
2019ba0a HR |
1371 | } |
1372 | ||
1373 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1374 | void (*attached_aio_context)(AioContext *, | |
1375 | void *), | |
1376 | void (*detach_aio_context)(void *), | |
1377 | void *opaque) | |
1378 | { | |
f21d96d0 KW |
1379 | BlockDriverState *bs = blk_bs(blk); |
1380 | ||
1381 | if (bs) { | |
1382 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1383 | detach_aio_context, opaque); |
1384 | } | |
2019ba0a HR |
1385 | } |
1386 | ||
3301f6c6 HR |
1387 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1388 | { | |
1389 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1390 | } | |
1391 | ||
1392 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1393 | { | |
1394 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1395 | } | |
1396 | ||
4be74634 MA |
1397 | void blk_io_plug(BlockBackend *blk) |
1398 | { | |
f21d96d0 KW |
1399 | BlockDriverState *bs = blk_bs(blk); |
1400 | ||
1401 | if (bs) { | |
1402 | bdrv_io_plug(bs); | |
a46fc9c9 | 1403 | } |
4be74634 MA |
1404 | } |
1405 | ||
1406 | void blk_io_unplug(BlockBackend *blk) | |
1407 | { | |
f21d96d0 KW |
1408 | BlockDriverState *bs = blk_bs(blk); |
1409 | ||
1410 | if (bs) { | |
1411 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1412 | } |
4be74634 MA |
1413 | } |
1414 | ||
1415 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1416 | { | |
7f0e9da6 | 1417 | return &blk->stats; |
4be74634 MA |
1418 | } |
1419 | ||
1420 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1421 | BlockCompletionFunc *cb, void *opaque) | |
1422 | { | |
1423 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1424 | } | |
1ef01253 | 1425 | |
983a1600 EB |
1426 | int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t offset, |
1427 | int count, BdrvRequestFlags flags) | |
1ef01253 | 1428 | { |
983a1600 | 1429 | return blk_co_pwritev(blk, offset, count, NULL, |
16aaf975 | 1430 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1431 | } |
1432 | ||
1433 | int blk_write_compressed(BlockBackend *blk, int64_t sector_num, | |
1434 | const uint8_t *buf, int nb_sectors) | |
1435 | { | |
e7f7d676 HR |
1436 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1437 | if (ret < 0) { | |
1438 | return ret; | |
1439 | } | |
1440 | ||
f21d96d0 | 1441 | return bdrv_write_compressed(blk_bs(blk), sector_num, buf, nb_sectors); |
1ef01253 HR |
1442 | } |
1443 | ||
1444 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1445 | { | |
c09ba36c HR |
1446 | if (!blk_is_available(blk)) { |
1447 | return -ENOMEDIUM; | |
1448 | } | |
1449 | ||
f21d96d0 | 1450 | return bdrv_truncate(blk_bs(blk), offset); |
1ef01253 HR |
1451 | } |
1452 | ||
1453 | int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) | |
1454 | { | |
e7f7d676 HR |
1455 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1456 | if (ret < 0) { | |
1457 | return ret; | |
1458 | } | |
1459 | ||
f21d96d0 | 1460 | return bdrv_discard(blk_bs(blk), sector_num, nb_sectors); |
1ef01253 HR |
1461 | } |
1462 | ||
1463 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1464 | int64_t pos, int size) | |
1465 | { | |
bfd18d1e KW |
1466 | int ret; |
1467 | ||
c09ba36c HR |
1468 | if (!blk_is_available(blk)) { |
1469 | return -ENOMEDIUM; | |
1470 | } | |
1471 | ||
bfd18d1e KW |
1472 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1473 | if (ret < 0) { | |
1474 | return ret; | |
1475 | } | |
1476 | ||
1477 | if (ret == size && !blk->enable_write_cache) { | |
1478 | ret = bdrv_flush(blk_bs(blk)); | |
1479 | } | |
1480 | ||
1481 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1482 | } |
1483 | ||
1484 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1485 | { | |
c09ba36c HR |
1486 | if (!blk_is_available(blk)) { |
1487 | return -ENOMEDIUM; | |
1488 | } | |
1489 | ||
f21d96d0 | 1490 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1491 | } |
f0272c4d ET |
1492 | |
1493 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1494 | { | |
c09ba36c HR |
1495 | if (!blk_is_available(blk)) { |
1496 | return -ENOMEDIUM; | |
1497 | } | |
1498 | ||
f21d96d0 | 1499 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1500 | } |
1501 | ||
1502 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1503 | { | |
c09ba36c HR |
1504 | if (!blk_is_available(blk)) { |
1505 | return -ENOMEDIUM; | |
1506 | } | |
1507 | ||
f21d96d0 | 1508 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1509 | } |
281d22d8 HR |
1510 | |
1511 | /* | |
1512 | * Updates the BlockBackendRootState object with data from the currently | |
1513 | * attached BlockDriverState. | |
1514 | */ | |
1515 | void blk_update_root_state(BlockBackend *blk) | |
1516 | { | |
f21d96d0 | 1517 | assert(blk->root); |
281d22d8 | 1518 | |
f21d96d0 KW |
1519 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1520 | blk->root_state.read_only = blk->root->bs->read_only; | |
1521 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1522 | |
1523 | if (blk->root_state.throttle_group) { | |
1524 | g_free(blk->root_state.throttle_group); | |
1525 | throttle_group_unref(blk->root_state.throttle_state); | |
1526 | } | |
f21d96d0 | 1527 | if (blk->root->bs->throttle_state) { |
49d2165d | 1528 | const char *name = throttle_group_get_name(blk); |
281d22d8 HR |
1529 | blk->root_state.throttle_group = g_strdup(name); |
1530 | blk->root_state.throttle_state = throttle_group_incref(name); | |
1531 | } else { | |
1532 | blk->root_state.throttle_group = NULL; | |
1533 | blk->root_state.throttle_state = NULL; | |
1534 | } | |
1535 | } | |
1536 | ||
38cb18f5 HR |
1537 | /* |
1538 | * Applies the information in the root state to the given BlockDriverState. This | |
1539 | * does not include the flags which have to be specified for bdrv_open(), use | |
1540 | * blk_get_open_flags_from_root_state() to inquire them. | |
1541 | */ | |
1542 | void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs) | |
1543 | { | |
1544 | bs->detect_zeroes = blk->root_state.detect_zeroes; | |
1545 | if (blk->root_state.throttle_group) { | |
1546 | bdrv_io_limits_enable(bs, blk->root_state.throttle_group); | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1552 | * supposed to inherit the root state. | |
1553 | */ | |
1554 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1555 | { | |
1556 | int bs_flags; | |
1557 | ||
1558 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1559 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1560 | ||
1561 | return bs_flags; | |
1562 | } | |
1563 | ||
281d22d8 HR |
1564 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1565 | { | |
1566 | return &blk->root_state; | |
1567 | } | |
1393f212 HR |
1568 | |
1569 | int blk_commit_all(void) | |
1570 | { | |
fe1a9cbc HR |
1571 | BlockBackend *blk = NULL; |
1572 | ||
1573 | while ((blk = blk_all_next(blk)) != NULL) { | |
1574 | AioContext *aio_context = blk_get_aio_context(blk); | |
1575 | ||
1576 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
1577 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
1578 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
1579 | if (ret < 0) { |
1580 | aio_context_release(aio_context); | |
1581 | return ret; | |
1582 | } | |
1583 | } | |
1584 | aio_context_release(aio_context); | |
1585 | } | |
1586 | return 0; | |
1587 | } | |
1588 | ||
1589 | int blk_flush_all(void) | |
1590 | { | |
1591 | BlockBackend *blk = NULL; | |
1592 | int result = 0; | |
1593 | ||
1594 | while ((blk = blk_all_next(blk)) != NULL) { | |
1595 | AioContext *aio_context = blk_get_aio_context(blk); | |
1596 | int ret; | |
1597 | ||
1598 | aio_context_acquire(aio_context); | |
1599 | if (blk_is_inserted(blk)) { | |
1600 | ret = blk_flush(blk); | |
1601 | if (ret < 0 && !result) { | |
1602 | result = ret; | |
1603 | } | |
1604 | } | |
1605 | aio_context_release(aio_context); | |
1606 | } | |
1607 | ||
1608 | return result; | |
1393f212 | 1609 | } |